Dehumidification Control - York International CMB SERIES Installation Manual

FIELD CONNECTIONS CONTROL WIRING
1. Route low voltage wiring into bottom of control box as shown in
Figure 5. Make low voltage wiring connections inside the junction
box per Figures 7-13.
2. The complete connection diagram and schematic wiring label is
located on the inside surface of the unit service access panel.
3. Replace the corner cover and service access panel that were
removed in Steps 2 and 4 of the "Field Connections Power Wiring"
section.
4. All field wiring to be in accordance with national electrical codes
(NEC) and/or local-city codes.
NOTE: A Start Assist Kit is available and recommended for long line set
applications or in areas of known low voltage problems.
5. Mount the thermostat about 5 ft. above the floor, where it will be
exposed to normal room air circulation. Do not place it on an out-
side wall or where it is exposed to the radiant effect from exposed
glass or appliances, drafts from outside doors or supply air grilles.
6. Route the 24-volt control wiring (NEC Class 2) from the outdoor
unit to the indoor unit and thermostat.
NOTE: To eliminate erratic operation, seal the hole in the wall at the
thermostat with permagum or equivalent to prevent air drafts
affecting the operation of in the thermostat.
Unitary Products Group

DEHUMIDIFICATION CONTROL

A dehumidification control accessory 2HU06700124 may be used with
variable speed air handlers or furnaces in high humidity areas. This
control works with the variable speed indoor unit to provide cooling at a
reduced air flow, lowering evaporator temperature and increasing latent
capacity. The humidistat in this control opens the humidistat contacts on
humidity rise. To install, refer to instructions packaged with the acces-
sory and Figures 8, 9, 11 & 13. Prior to the installation of the dehumidifi-
cation control, the jumper across the HUMIDISTAT terminals on the
indoor variable speed air handler or furnace CFM selection board must
be removed.
During cooling, if the relative humidity in the space is higher than the
desired set point of the dehumidification control, the variable speed
blower motor will operate at lower speed until the dehumidification con-
trol is satisfied. A 40-60% relative humidity level is recommended to
achieve optimum comfort.
If a dehumidification control is installed, it is recommended that a mini-
mum air flow of 325 cfm/ton be supplied at all times.
For additional connection diagrams for all UPG equipment refer to "Low
Voltage System Wiring" document available online at www.upgnet.com
in the Product Catalog Section.
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